<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    *{
      padding: 0;
      margin: 0;
    }
    body{
      background: #f5f5f5;
    }
    .box{
      width: 1230px;
      height: 615px;
      border: 1px solid red;
      display: flex;
      justify-content: space-between;  /*设置对齐方式是两端对齐*/
    }
    .box>div{ /*.box的子级div们*/
      width: 234px;
      height: 615px;
      
    }
    .box>div>div{
      width: 234px;
      height: 300px;
      background: #fff;
    }
    .mb15{
      margin-bottom: 15px;
    }

  </style>
</head>
<body>
  <div class="box">
    <div>1</div>
    <div>
      <div class="mb15">2-top</div>
      <div>2-bottom</div>
    </div>
    <div>
      <div class="mb15">3-top</div>
      <div>3-bottom</div>
    </div>
    <div>
      <div class="mb15">4-top</div>
      <div>4-bottom</div>
    </div>
    <div>
      <div class="mb15">5-top</div>
      <div>5-bottom</div>
    </div>
  </div>
</body>
</html>